Tiling concrete floor and UF heating

[Dumbo]

Harry said prime

 

[The Tiler]

Steve, the reason I stopped using these boards is because the need to prime face and underside. Yes the boards are cheep, but the time and space needed to prime and then completely dry let them dry is uneconomical.
The unprimed boards have added to the failure and not fixing to a flat surface, SLC, was the first mistake.
How you proceed now is between you and your old / new tiler.
I would be very surprised if a new tiler is happy to continue the work knowing the problems.

 

[Flintstone]

Steve, the reason I stopped using these boards is because the need to prime face and underside. Yes the boards are cheep, but the time and space needed to prime and then completely dry let them dry is uneconomical.
The unprimed boards have added to the failure and not fixing to a flat surface, SLC, was the first mistake.
How you proceed now is between you and your old / new tiler.
I would be very surprised if a new tiler is happy to continue the work knowing the problems.

Hello Mr tiler, introduce your self !

I'm not sure which boards you are referring to but none of them need priming, coated or not. I personally prime the face to be tiled once the boards are down but it's not really required

 

[The Tiler]

hi Local
the XP pro type, insulation foam only, comes in blue or cheaper yellow from my supplier. Use only the backer board / fibre glass cover insulation now.
It no longer says to prime the underside on the fixing info but always did and logic says it needs doing. If top side needs priming before applying SLC or adhesive why would the underside not need it?

 

[Flintstone]

The blue or yellow uncoated boards shouldnt be primed. The coated boards I only prime the surface to stop it sucking the moisture from the slc quickly and to help it flow, there's no point priming the back at all

 

[The Tiler]

sorry Local, don't want to come on here and point out you maybe wrong
just checked again and here is a screen shot

item 3

 

[The Tiler]

don't know what happened there,
yesterdays walk on the beach pic

 

[Flintstone]

That is referring to boards to take pipes for water underfloor heating

 

[The Tiler]

it is, but is exactly the same material. Did have the same product info for the ungroved boards upto recently.
Why would you treat the same material any different? Both are stuck down to the sub floor with the same tile adhesive.
It makes no difference what the heating is on top, wire or water, or board thickness imho.
we are all here to learn, and I am happy to be shown I doing something wrong.
be interesting to here if any other Trusted Advisors have used these products and there fixing methods.
I use the water pipe ones a fair bit with a local plumper doing the wet bits ready for me to tile using Ditra or 10mm SLC ready for others to put on other floor covering

 

[Flintstone]

I agree it doesn't matter what's on top it is the same material If they are the foam type. There is a few types of carriers for pipes that's why I asked. I only ever use coated board as they are far superior